visibility: hidden;
隐藏元素，但是保留原来的位置
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>visibility(重点)</title>
	<style>
		.damao {
			visibility: hidden;
			/*visibility: visible; */
			width: 200px;
			height: 200px;
			background-color: orange;
		}

		.ermao {
			width: 200px;
			height: 200px;
			background-color: pink;
		}
	</style>
</head>
<body>
	<div class="damao"></div>
	<div class="ermao"></div>
</body>
</html>